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Abraham Lincoln, who had declared "Government cannot endure permanently half slave, half free..." is elected president, the first Republican, receiving 180 of 303 possible electoral votes and 40 percent of the popular vote.
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South Carolina was followed within two months by Mississippi, Florida, Alabama, Georgia, Louisiana and Texas.
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The Confederate States of America is formed with Jefferson Davis, a West Point graduate and former U.S. Army officer, as president.
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Abraham Lincoln is sworn in as 16th President of the United States of America.
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At 4:30 a.m. Confederates under Gen. Pierre Beauregard open fire with 50 cannons upon Fort Sumter in Charleston, South Carolina. The Civil War begins.
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President Lincoln issues a Proclamation calling for 75,000 militiamen, and summoning a special session of Congress for July 4.
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Virginia secedes from the Union, followed within five weeks by Arkansas, Tennessee, and North Carolina, thus forming an eleven state Confederacy with a population of 9 million, including nearly 4 million slaves. The Union will soon have 21 states and a population of over 20 million.
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The Union Army under Gen. Irvin McDowell suffers a defeat at Bull Run 25 miles southwest of Washington. Confederate Gen. Thomas J. Jackson earns the nickname "Stonewall," as his brigade resists Union attacks. Union troops fall back to Washington. President Lincoln realizes the war will be long.
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President Lincoln is struck with grief as his beloved eleven-year-old son, Willie, dies from fever, probably caused by polluted drinking water in the White House.
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The Confederate Ironclad 'Merrimac' sinks two wooden Union ships then battles the Union Ironclad 'Monitor' to a draw. Naval warfare is thus changed forever, making wooden ships obsolete.
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Confederate surprise attack on Gen. Ulysses S. Grant's unprepared troops at Shiloh on the Tennessee River results in a bitter struggle with 13,000 Union killed and wounded and 10,000 Confederates, more men than in all previous American wars combined.
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Lee invades the North with 50,000 Confederates and heads for Harpers Ferry, located 50 miles northwest of Washington.
The Union Army, 90,000 strong, under the command of McClellan, pursues Lee. -
The bloodiest day in U.S. military history as Gen. Robert E. Lee and the Confederate Armies are stopped at Antietam in Maryland by McClellan and numerically superior Union forces. By nightfall 26,000 men are dead, wounded, or missing. Lee then withdraws to Virginia
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Preliminary Emancipation Proclamation freeing slaves issued by President Lincoln.
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The Stars and Stripes is ceremoniously raised over Fort Sumter. That night, Lincoln and his wife Mary see the play "Our American Cousin" at Ford's Theater. At 10:13 p.m., during the third act of the play, John Wilkes Booth shoots the president in the head. Doctors attend to the president in the theater then move him to a house across the street. He never regains consciousness.